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Csound is a sound and music synthesis system, providing facilities for composition and performance over a wide range of platforms. It is not restricted to any style of music, having been used for many years in at least classical, pop, techno, ambient

Pymprovisator is a program for jazz musicians. Jazz music is based on improvisation and this program is intended to help musicians to improvise. The user sets the song parameters and the program generates a MIDI file with an adequate accompaniment.

Kraptor is a classic shoot 'em up scroller game, where you must fight against tons of bad dudes. This is a full game with massive destruction, powerful weapons, and high speed action in varied levels.
Works for Linux, DOS, Windows, QNX, Mac Os, etc..